Free QR Code Generator

What Is a QR Code?

A QR (Quick Response) code is a two-dimensional matrix barcode invented in 1994 by Denso Wave for tracking automotive components. Unlike a traditional 1D barcode that encodes data in parallel lines, a QR code stores information in a grid of black and white squares. That structure allows it to hold significantly more data — up to 4,296 alphanumeric characters — and to be read from any rotation angle.

QR codes include Reed-Solomon error correction, which means a code can still be scanned even if up to 30% of its surface is damaged or obscured. This makes them well suited for printed labels that may be scratched, folded, or partially covered.

When to Use a QR Code vs. a Barcode

QR codes are the right choice when the data you need to encode is long (a URL, a contact card, a WiFi password) or when users will scan with a smartphone camera. They are also better for situations where orientation is uncertain — for example, labels affixed at odd angles on packaging.

Traditional 1D barcodes such as Code 128 or UPC-A remain standard in retail and logistics because they are faster to scan with a laser scanner and work at longer distances. Use QR codes for engagement (linking to a website, sharing contact info, embedding WiFi credentials) and 1D barcodes for operational tracking and retail point-of-sale.

Printing QR Codes That Actually Scan

The most common reason a printed QR code fails to scan is insufficient size. A QR code should be at least 1 cm (0.4 inches) square when printed — and larger for any scanning distance beyond arm's reach. Use our QR print size calculator to find the right dimensions for your use case.

Always maintain a quiet zone — a blank border of at least four modules (squares) around the code. This border is not decoration; scanners use it to locate the code boundary. Export as SVG for sharp results at any print size, or as PNG at 300 DPI for offset and digital printing.

On thermal printers, avoid low-density QR codes at small sizes. The dithered output from a 203 DPI thermal head can break fine modules. Set error correction to H (30%) when printing on surfaces prone to wear, or M (15%) when label real estate is limited.

Frequently Asked Questions